Well, "subjective" is the wrong word, but I get what you mean. However, aren't they just word games? It's not like theology and philosophy study anything real. They just investigate what can be deduced from specific axiomatic systems that are entirely divorced from reality. Theologians aren't even consistent, since they have dogmas that they'll contort around in order to avoid contradicting, even if that involves contradicting other parts of scripture.
I'll never forget the time I asked a philosophy undergraduate why he decided to go to university for philosophy rather than just reading the bibliography by himself, and he told me that by doing so he could teach philosophy. An academic pyramid scheme.